How vines climb,______, and what special needs they have all make a big difference when deciding where to put vines.

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问题 How vines climb,______, and what special needs they have all make a big difference when deciding where to put vines.

选项 A、they can be planted
B、when they plant
C、can they be planted
D、when they can be planted

答案D

解析 The noun clause when they can be planted is parallel to the other noun clauses in the list: how vines climb and what special needs they have.

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